JPS64681Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding tool for contact members used in the maintenance, inspection and repair of open contact type electromagnetic relays such as wire spring relays.

Open-contact electromagnetic relays such as wire spring relays, which are used as electrical signal switching elements in various communication devices such as telephone exchanges, require regular maintenance and repair to ensure highly reliable operation of communication devices. need to be done. However, conventionally, there is no good tool that can easily repair the contacts of open contact type electromagnetic relays that have deteriorated due to contact wear after a certain period of use by ensuring the specified contact pressure and contact resistance. I had no choice but to exchange it. This inevitably results in an increase in the number of man-hours required for maintenance, inspection and repair.

The purpose of the present invention is to provide a tool that can be used to perform maintenance, inspection and repair of open contact type electromagnetic relays, such as wire spring relays, by peeling off deteriorated contacts of the relay and then welding new contacts to the replaced parts.

A contact welding tool for an electromagnetic relay according to the present invention includes a first electrode member that holds a contact material by pressing it against an elastic member, and a contact holding spring of the relay that is sandwiched on the contact material held by the first electrode member. The present invention is characterized by comprising a second electrode member, an operating member that opens and closes between these electrode members, and a member that forms an energization path to the first and second electrode members.

Embodiments of the present invention will be described below with reference to the drawings.

First, referring to FIG. 1, which shows an example of a commonly used wire spring relay, reference numeral 1
is the iron core, 2 is the winding, 3 is the contact (armature),
4 is a core plate, 5 is a make movable spring, 6 is a break movable spring, 7 is a fixed spring, 8 is a balance spring (resta spring), 9 is a drive card, 10 is a back stop, 11 is a make contact, 12 is a break contact, 13 is a fixed contact, 14 is a contact or bar, and 15 is a fixed spring mold. As is well known, the make movable spring 5 and the break movable spring 6 are each made of twin wires.

When the movable contact of such a wire spring relay is welded after peeling, Fig. 2 shows an embodiment of the welding tool according to this invention, and Figs. 3, 4, and 5 show the operating state of the welding tool. and explain. With the relay having contacts deteriorated due to long-term use mounted on the communication device, the contact cover 14 is removed and the deteriorated contacts are removed using a predetermined stripping tool. Thereafter, the operating rod 21i of the movable contact welding tool 21 is pressed to rotate the movable spring electrode holder 21d about the electrode holder pin 21e, and the movable spring electrode holder 21d is fixed to the holder 21d. The movable spring electrode 21a is opened in the direction of arrow A. Subsequently, the contact material 30 is inserted into the groove 21b' formed in the movable contact electrode 21b and held by the presser spring 21c (see FIGS. 3 and 4). Furthermore, the distal end portion of the movable spring 5 or 6 from which the contact has been released is placed on the contact material 30 to release the pressing force of the operating rod 21i. As a result, the movable spring electrode holder 21d receives the repulsive force of the spring 21h, and as shown in FIG.
The movable spring 5 of the wire spring relay and the replacement contact material 30 are held between the movable contact electrode 21b and the movable contact electrode 21b. In order to securely hold the movable spring 5, which is elongated and has a bent tip, a groove 21a' is provided at the tip of the movable spring electrode 21a. Next, when power is applied between the pin electrodes 21l and 21m from an external welding power source (not shown), the pin electrode 21l, the lead wire 21k, the movable spring electrode holder 21d, the movable spring electrode 21a, and the tip of the movable spring 5. Part - Contact material 30 - Movable contact electrode 21
b - Electrode holder for movable contact 21f - Conductive plate 21
A current flows through the path of the G-pin electrode 21m, resistance welding is performed due to contact resistance between the movable spring 5 and the contact material 30, and the contact material 30 is welded to the tip of the movable spring 5. After welding the movable contacts, the movable spring 5 is removed from the welding tool 21 by pushing down the operating rod 21i again to open the space between the electrodes 21a and 21b. Thereafter, the extra length of the contact material 30, which is made long enough to insert and hold the movable contact electrode 21b into the groove 21', is cut using a predetermined cutting tool. Note that each component of the welding tool 21 is arranged in an insulating case 21j.

In the above-mentioned embodiment, the case of replacing the contacts of the movable spring of a wire spring relay was explained, but it can be performed in the same way with other open contact type electromagnetic relays, and it can also be applied to fixed springs with fixed contacts fixed. be.

As explained above, according to the present invention, contacts that have deteriorated due to wear or the like can be extremely easily replaced during maintenance, inspection, and repair of an electromagnetic relay, and costs required for maintenance can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a commonly used open contact type electromagnetic relay, and Figs. 2, 3, 4, and 5 show an embodiment of a contact welding tool according to the present invention. FIG. 21... Contact welding tool, 21a... Electrode for movable spring, 21b... Electrode for movable contact, 21c... Presser spring, 21d... Electrode holder for movable spring, 2
1e... Electrode holder pin, 21f... Electrode holder for movable contact, 21g... Conductive plate, 21h...
Pressure spring, 21i... Operating rod, 21j...
...Insulating case, 21k...Lead wire, 21l,
21m...Pin electrode, 30...Contact material.

Claims (1)

[Scope of utility model registration request] A first electrode member that holds a contact material by pressing it against an elastic member, a second electrode member that holds a contact holding spring of a relay on the contact material held by the first electrode member, and these electrode members. A contact welding tool for an electromagnetic relay, comprising: an operating member for opening and closing the gap; and a member for forming a conduction path to the first and second electrode members.